Sync Repo-README from project files

Repo-README.-.md

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-<!-- codex-wiki-sync:139e4e60b6b7392eb32edecd -->
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 > Mirrored from `/mnt/DATA/git/govoplan-services/README.md`.
 > Origin: `repository`.
@@ -21,3 +21,18 @@ the same exact provider-owned definition through Core contracts. Neither module
 reads Services tables.
 
 See [docs/SERVICES_DOMAIN.md](docs/SERVICES_DOMAIN.md).
+
+## Runtime Bindings
+
+Services stores bindings but does not execute them. Portal resolves the exact
+Service revision and delegates to the matching owner capability:
+
+- `case`: a Cases-owned catalogue or intake reference;
+- `form`: an exact `<form-id>/<form-revision>` reference launched by Forms
+  Runtime;
+- `workflow`: an exact Workflow Engine definition binding; and
+- `url` or `external`: a validated redirect target.
+
+Consumers must retain the exact Service revision and binding. A missing owner
+launcher makes the Service unavailable; it must not fall back to an unrelated
+runtime.